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Isolation and Enumeration of Fungi and Determination Of Isolation and Enumeration of Fungi and Determination of Contributing Factors to Fungal Spoilage in Maize (Zea mays L.) Originated from Selected Woredas of Oromia, Ethiopia By: Temesgen Assefa Gelaw A Thesis Submitted to The Department of Applied Biology in Partial Fulfillment of the Requirement of the Award of degree of Master of Science in Applied Biology (Biotechnology) School of Applied Natural Science Office of Graduate Studies Adama Science and Technology University Adama, Ethiopia June, 2019 Isolation and Enumeration of Fungi and Determination of Contributing Factors to Fungal Spoilage in Maize (Zea mays L.) Originated from Selected Woredas of Oromia, Ethiopia By; Temesgen Assefa Gelaw Advisor: Dr. Teshome Geremew (PhD) A Thesis Submitted to the Department of Applied Biology in Partial Fulfillment of the Requirement of the Award of Degree of Master of Science in Applied Biology (Biotechnology) School of Applied Natural Science Office of Graduate Studies Adama Science and Technology University Adama, Ethiopia June, 2019 APPROVAL SHEET Adama Science and Technology University School of Applied Natural Science Department of Applied Biology This is to certify that the thesis prepared by Temesgen Assefa Gelaw entitled “Isolation and Enumeration of fungi and Determination of Contributing Factors to Fungal Spoilage in Maize (Zea mays L.) Originated from selected woredas of Oromia, Ethiopia” Submitted in Partial Fulfillment of the Requirement of the Award of Degree of Master of Science in Applied Biology (Biotechnology) complies with the regulation of the university. Temesgen Assefa Student Name Signature Date Dr. Teshome Geremew Advisor Signature Date Dr. Zerihun Belay Internal examiner Signature Date Dr. Rediet Sitotaw External examiner Signature Date Dr. Bayisa Chala Department chairman Signature Date School Dean Signature Date Postgraduate Dean Signature Date DECLARATION I hereby declare that this thesis entitled “Isolation and Enumeration of fungi and Determination of Contributing Factors to Fungal Spoilage in Maize (Zea mays L.) Originated from selected woredas of Oromia, Ethiopia” submitted to Adama Science and Technology University for the award of degree of Master of Science in Applied Biology (M.Sc. in Biotechnology) is the results of the research work carried out by me. I affirm that I have cited and referenced all sources used in this document. Brief quotation from this thesis may be used without special permission provided that accurate and complete acknowledgment of the source is made. To the best of my knowledge, I sincerely declare that this thesis has not been submitted to any other institution anywhere for the award of any academic degree, diploma or certificate. Name: Temesgen Assefa Gelaw Signature: ----------------------- Date: ---------------------------- This M.Sc. thesis had been submitted for examination with approval as thesis advisor. Name: ------------------------------ Signature: - ------------------------ Date: ------------------------------- DEDICATION This thesis work is dedicated to my beloved parents and the rural community. ACKNOWLEDGMENTS First, I want to praise the almighty God for his unlimited blessings in all my achievements. Next, I would like to gratefully acknowledge my Advisor Dr. Teshome Geremew (PhD) for his sponsorship, strong commitment, enthusiasm and paternal approach during the research. I am really grateful for his follow up and motivation from the beginning to the end of my work. His professional and technical advice from sample collection to laboratory session with provision of every laboratory inputs makes me confidential and mannered. My heartfelt gratitude goes to my intimate and special gift Meskerem Kedru for her motivation and love. I extend my deepest gratitude to Adama Science and Technology University particularly for Applied Biology Department for its cooperation and providing me with all the necessary laboratory facilities for this study. Moreover, I am Indebted to Addis Ababa University and Mrs. Zenebech Aytenew for giving me the moisture tester and fungal dye. My appreciation also goes to the sample area Agricultural and rural development office for provision of relevant data for the sample areas. Moreover, I am heart fully indebted to the agricultural experts and extension workers for their dedicated technical and professional support during sample collection. I also thank the farmers and maize owners for their kind cooperation in giving maize samples. I kindly thank my staff members for experience sharing and for all what they did for me. Their all rounded and unconditional moral support enabled me to realize my educational goal. My special appreciation goes to Mr. Yeshaneh Admasu for his kind motivation and support. Finally, I am grateful to extend my deepest and heartfelt gratitude to my parents Ato Assefa Gelaw and W/ro Sewnet Yimech, my brothers, sisters and friends for their care, support, encouragement and love. i Tables of Contents Contents Page ACKNOWLEDGMENTS ......................................................................................................................... i LIST OF TABLES .................................................................................................................................. iv LIST OF FIGURES .................................................................................................................................. v LIST OF ACRONYMS ........................................................................................................................... vi ABSTRACT .......................................................................................................................................... viii 1. INTRODUCTION ................................................................................................................................ 1 1.1 Background of the study………………..…………………………………………………………1 1.2 Statement of Problem…………….……………………………………………………………….2 2. OBJECTIVES OF THE STUDY ......................................................................................................... 3 2.1 General Objective……………………………………………………………………………........3 2.2 Specific objectives…………………………………………………………………………….......3 2.3 Significance of the study………………………………………………………………………….3 3. LITERATURE REVIEW…………………………………………………………………………….4 3.1 Biology of Fungi………………………………………………………………………………….4 3.1 The Role of Fungi in Postharvest Losses of Maize……………………………………………….5 3.2. Traditional Grain Storage in Ethiopia…………………………………………………………….6 3.3 Fusarium and its importance in maize…………………………………………………………….7 3.3.1 Fumonisins .................................................................................................................. 7 3.3.2 Trichothecenes ............................................................................................................ 8 3.3.3 Zearalenone ................................................................................................................. 9 3.4 Aspergillus and its importance in maize…………………………………………………………..9 3.4.1 Aflatoxin and its Exposure ........................................................................................ 10 3.5 Factors influencing fungal infection of maize…………………………………………………...12 3.6 Control of Fungal contamination………………………………………………………………...13 3.6.1 Pre-harvest control ................................................................................................... 13 3.5.2 Post-harvest control .................................................................................................. 14 4. MATERIALS AND METHODS ....................................................................................................... 15 4.1 Description of sampling area…………………………………………………………………….15 4.2 Sample type, size and sampling technique………………………………………………………16 4.3 Fungal isolation and morphological characterization……………………………………………17 4.4 Data analysis……………………………………………………………………………………..18 5. RESULTS AND DISCUSSIONS ...................................................................................................... 19 ii 5.1 Fungal isolation from maize……………………………………………………………………..19 6. CONCLUSION AND RECOMMENDATIONS ............................................................................... 31 6.1. CONCLUSION………………………………………………………………………………….31 6.2. RECOMMENDATIONS………………………………………………………………………..32 REFERENCES ....................................................................................................................................... 33 APPENDICES ........................................................................................................................................ 43 iii LIST OF TABLES Table 1: Mean fungal percent of infection on maize sampels obtained from 12 districts ......... 21 Table 2: Correlation between moisture content, storage duration and fungal infection. ........... 22 Table 3: Moisture content and percent of infection record of the maize samples. .................... 24 Table 4: Fungal genera isolated from maize samples…………………………………………28 iv LIST OF FIGURES Figure 1: Map of the study area. ................................................................................................ 16 Figure 2: Incidence of fungal genera and fungal percent of infection on maize . .................... 20 Figure 3: Maize storage type versus percent of infection ......................................................... 23 Figure 4: Sample source versus fungal percent of infection. ...................................................
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